f The difference between the total of SIC 37 and the sum of 371, 372, 373, and 374.

g The difference between the total of SIC 55 and the sum of 551, 553, and 554.

h Not all government agencies are included (e.g., the National Transportation Safety Board).

i U.S. Department of Transportation was created in 1966. Data are for fiscal year and include permanent civilians as well as temporary employees and military.

j Full-time equivalent employment. Data prior to 1986 are not directly comparable to data from later years due to a change in the way full-time equivalent was calculated. Full-time equivalent was not calculated for 1985.

k Due to a change in the reference period, from October to March, the October 1996 Annual Survey of Government Employment and Payroll was not conducted.

NOTE

The employment totals in tables 3-19 and 3-20 differ. Table 3-19 shows employment in transportation and selected transportation-related industries. Table 3-20 shows employment by transportation occupation. Some employees of transportation industries have nontransportation jobs (e.g., a bookkeeper in a trucking firm), and some people with transportation occupations do not work in the transportation industry (e.g., a truck driver for a construction firm). Beginning in January 1999, data are not strictly comparable with data for 1998 and earlier years because of revisions in the population controls used in the household survey.

SOURCES

All data, except as noted:

1960-85: U.S. Department of Labor, Bureau of Labor Statistics, Employment, Hours and Earnings, United States, 1909-1994 (Washington, DC: September 1994).

1990-2002: Ibid., Internet site www.bls.gov, database query for individual series as of June 11, 2003.

Government employment:

USDOT:

1970-75: U.S. Department of Commerce, Bureau of the Census, Statistical Abstract of the United States, 1976 (Washington, DC: 1976), table 409, and U.S. Department of Transportation, U.S. Coast Guard, G-WPM, Office of Military Personnel, personal communication.

1980-85: U.S. Department of Transportation, Office of the Secretary of Transportation, DOT Employment Facts, A Report to Management (Washington, DC: Annual issues).